AISI 430 ve HARDOX 500 çeliklerinin CMT yöntemi ile kaynaklanabilirliğinin araştırılması

Öz

Bu çalışmada AISI-430 ve HARDOX 500 çelikleri Cold Metal Transfer (CMT) kaynak tekniği ile kaynak edilmiş, kaynak ve ITAB (Isı Tesiri Altındaki Bölge) bölgelerindeki mekanik özelliklerinde meydana gelen değişimler incelenmiştir. 100x130x6 mm boyutlarındaki AISI 430 ve HARDOX 500 çelikleri, şerit testere ile standart ebatlarda kesilerek, AWS 307 ilave tel kullanılarak CMT yöntemi ile birleştirilmiştir. Kaynaklı bölgelerin mekanik özellikleri ve mikroyapısal değişimleri çeşitli analizlerle ve mikrosertlik, çentik darbe ve çekme testleriyle ve deney numunelerinin çekme testinden sonra kopan yüzeyleri SEM analizleri ile incelenmiştir. Kaynak işlemi 140 A, 130 A ve 120 A akımlarda gerçekleştirilmiştir. Koruyucu gaz olarak %97.5 Argon ve %2.5 CO2 gazı kullanılmıştır. Kaynak sonrası optik görüntülerden morfolojilerdeki farklılıkların oluştuğu tespit edilmiştir. ITAB bölgelerinde kaba taneler oluşmuş, ancak bunlar CMT kaynağının düşük sıcaklık girdisi ile sınırlı miktarlarda kalmıştır. EDS analiz sonuçlarına göre bölgeler arasında atom geçişleri olduğu tespit edilmiştir. Sertlik analizinde, ITAB bölgelerinde ana metallere göre bir miktar sertlikte düşüş olmuştur. Çekme deneyinde 3 numune de AISI 430 ana malzeme kısmından kopmuştur. Uzama miktarları; 16.81 ile 17.90 mm arasında, çekme mukavemetleri de 417 ile 441 MPa arasında ölçülmüştür. Çalışma sonucunda CMT Kaynağı ile birleştirilen AISI 430 ve HARDOX 500 çeliklerinin kaynak bölgesindeki mekanik özelliklerinin önemli ölçüde arttığı ve kaynak edilebilirliğin mümkün olduğu ortaya konmuştur.

Anahtar Kelimeler

• CMT
• Kaynak
• AISI 430
• HARDOX 500
• Mekanik özellik
• Mikroyapı

Investigation of the weldability of AISI 430 and HARDOX 500 steels by CMT method

Abstract

In this study, AISI-430 and HARDOX 500 steels were welded with Cold Metal Transfer (CMT) welding technique, and the changes in the mechanical properties in the welding and HAZ (Heat Affected Zone) regions were investigated. 100x130x6 mm AISI 430 and HARDOX 500 steels were cut in standard sizes with a band saw and joined by the CMT method using AWS 307 additional wire. The mechanical properties and microstructural changes of the welded areas were investigated by various analyses, microhardness, notch impact, and tensile tests, and the ruptured surfaces of the test specimens after the tensile test were investigated by SEM analysis. Welding was carried out at 140 A, 130 A, and 120 A current. 97.5% Argon and 2.5% CO2 gas were used as shielding gas. It has been determined that there are differences in morphology from the optical images after welding. Coarse grains were formed in the HAZ regions but were limited to the low-temperature input of the CMT welding. According to the EDS analysis results, it has been determined that there are atomic transitions between the regions. In the hardness analysis, there was a slight decrease in hardness in the HAZ regions compared to the base metals. In the tensile test, all 3 samples broke from the AISI 430 main material part. Elongation amounts were measured between 16.81 and 17.90 mm, and tensile strengths were measured between 417 and 441 MPa. As a result of the study, it has been revealed that the mechanical properties of AISI 430 and HARDOX 500 steels combined with CMT Welding have increased significantly in the weld zone and weldability is possible.

Keywords

• CMT
• Welding
• AISI 430
• HARDOX 500
• Mechanical property
• Microstructure

Kaynakça

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